MRK Options Open Interest by Strike, Oct 21 Settlement

MRK open interest settled 2026-10-21 vs 2026-10-20.

Source: SquawkFlow's archive of settled open interest. Counts are contracts, not trades; they do not identify which side opened or closed a position.

Computed from the Oct 21 settlement. Next update after the Oct 22 settlement, after 5:30 a.m. PT (8:30 a.m. ET) on Friday, Oct 23, 2026.

All archived unexpired expiration/strike/type keys, including unchanged counts. Series sharing that key are combined; roots and deliverables are not retained. Zero-OI keys omitted by the archive are not reconstructed.

This page shows the 6 nearest of 15 expirations, with the 40 strikes nearest the archived reference price (2026-10-21) for each, plus the largest changes across the whole book. The complete book, 870 expiration/strike/type keys, is in the Markdown table.

Strike bucket on the horizontal axis, settled open contracts per bucket on the vertical axis. Calls in the accent color; puts in orange. Totals across the 6 nearest expirations, strikes from 119 to 179. Source: SquawkFlow's archive of settled open interest. Counts are contracts, not trades; they do not identify which side opened or closed a position.

MRK: largest changes in the full book, settled 2026-10-21 vs 2026-10-20

Strike	Expiry	Type	Prior OI	Settled OI	Change
160	10/30	call	2,189	10,416	+8,227
170	10/30	call	399	8,125	+7,726
130	01/15	put	11,838	14,307	+2,469
150	10/30	put	19	1,004	+985
165	10/30	call	214	1,181	+967
135	10/30	put	240	1,091	+851
150	10/30	call	638	1,396	+758
147	11/20	put	2	501	+499
200	03/19	call	123	597	+474
148	10/23	put	300	769	+469
220	03/19	call	72	531	+459
167.5	11/13	call	5	430	+425
165	11/20	call	4,042	4,431	+389
143	10/23	put	198	388	+190
149	10/30	call	137	290	+153

Expiration 2026-10-23

MRK open interest, settled 2026-10-21, expiration 2026-10-23, strikes 110 to 185

Strike	Expiry	Type	Prior OI	Settled OI	Change
110	10/23	call	1	1	0
110	10/23	put	3	3	0
115	10/23	put	23	23	0
120	10/23	call	1	1	0
120	10/23	put	75	75	0
125	10/23	put	237	237	0
129	10/23	put	8	8	0
130	10/23	call	9	18	+9
130	10/23	put	1,684	1,683	-1
131	10/23	call	0	15	+15
131	10/23	put	14	12	-2
132	10/23	call	0	4	+4
132	10/23	put	26	26	0
133	10/23	call	0	4	+4
133	10/23	put	46	46	0
134	10/23	put	54	54	0
135	10/23	call	4	4	0
135	10/23	put	226	226	0
136	10/23	call	4	7	+3
136	10/23	put	117	112	-5
137	10/23	call	22	27	+5
137	10/23	put	85	132	+47
138	10/23	call	26	26	0
138	10/23	put	62	61	-1
139	10/23	call	41	38	-3
139	10/23	put	90	90	0
140	10/23	call	85	84	-1
140	10/23	put	2,587	2,582	-5
141	10/23	call	106	105	-1
141	10/23	put	665	661	-4
142	10/23	call	93	95	+2
142	10/23	put	160	203	+43
143	10/23	call	41	99	+58
143	10/23	put	198	388	+190
144	10/23	call	93	129	+36
144	10/23	put	775	769	-6
145	10/23	call	210	209	-1
145	10/23	put	225	222	-3
146	10/23	call	2,225	2,218	-7
146	10/23	put	115	119	+4
147	10/23	call	775	772	-3
147	10/23	put	171	172	+1
148	10/23	call	572	558	-14
148	10/23	put	300	769	+469
149	10/23	call	273	272	-1
149	10/23	put	24	33	+9
150	10/23	call	2,464	2,466	+2
150	10/23	put	35	37	+2
152.5	10/23	call	1,510	1,563	+53
152.5	10/23	put	3	3	0
155	10/23	call	1,011	1,048	+37
155	10/23	put	6	6	0
157.5	10/23	call	238	243	+5
160	10/23	call	873	878	+5
160	10/23	put	1	1	0
162.5	10/23	call	29	39	+10
165	10/23	call	74	74	0
167.5	10/23	call	80	80	0
170	10/23	call	67	67	0
172.5	10/23	call	51	51	0
175	10/23	call	12	12	0
177.5	10/23	call	11	11	0
180	10/23	call	17	17	0
182.5	10/23	call	12	12	0
185	10/23	call	34	34	0

Expiration 2026-10-30

MRK open interest, settled 2026-10-21, expiration 2026-10-30, strikes 105 to 190

Strike	Expiry	Type	Prior OI	Settled OI	Change
105	10/30	put	1	1	0
110	10/30	put	14	14	0
115	10/30	put	28	28	0
120	10/30	call	2	2	0
120	10/30	put	117	117	0
125	10/30	call	10	10	0
125	10/30	put	100	99	-1
129	10/30	call	8	8	0
129	10/30	put	31	31	0
130	10/30	call	19	19	0
130	10/30	put	466	466	0
131	10/30	call	22	22	0
131	10/30	put	34	33	-1
132	10/30	call	25	25	0
132	10/30	put	50	50	0
133	10/30	call	11	14	+3
133	10/30	put	318	367	+49
134	10/30	call	12	12	0
134	10/30	put	47	47	0
135	10/30	call	17	16	-1
135	10/30	put	240	1,091	+851
136	10/30	call	4	6	+2
136	10/30	put	154	154	0
137	10/30	call	13	13	0
137	10/30	put	166	167	+1
138	10/30	call	36	42	+6
138	10/30	put	1,610	1,670	+60
139	10/30	call	2	13	+11
139	10/30	put	71	124	+53
140	10/30	call	1,268	1,268	0
140	10/30	put	636	698	+62
141	10/30	call	19	19	0
141	10/30	put	49	51	+2
142	10/30	call	41	42	+1
142	10/30	put	53	60	+7
143	10/30	call	146	145	-1
143	10/30	put	889	890	+1
144	10/30	call	80	80	0
144	10/30	put	307	312	+5
145	10/30	call	124	123	-1
145	10/30	put	452	496	+44
146	10/30	call	1,293	1,294	+1
146	10/30	put	128	245	+117
147	10/30	call	3,326	3,326	0
147	10/30	put	96	240	+144
148	10/30	call	627	609	-18
148	10/30	put	86	190	+104
149	10/30	call	137	290	+153
149	10/30	put	45	134	+89
150	10/30	call	638	1,396	+758
150	10/30	put	19	1,004	+985
152.5	10/30	call	3,075	3,085	+10
152.5	10/30	put	24	47	+23
155	10/30	call	807	829	+22
155	10/30	put	43	83	+40
157.5	10/30	call	257	269	+12
157.5	10/30	put	10	10	0
160	10/30	call	2,189	10,416	+8,227
160	10/30	put	1	1	0
162.5	10/30	call	176	188	+12
165	10/30	call	214	1,181	+967
167.5	10/30	call	259	263	+4
170	10/30	call	399	8,125	+7,726
172.5	10/30	call	68	69	+1
175	10/30	call	9	10	+1
180	10/30	call	45	45	0
185	10/30	call	16	16	0
190	10/30	call	2	2	0

Expiration 2026-11-06

MRK open interest, settled 2026-10-21, expiration 2026-11-06, strikes 110 to 215

Strike	Expiry	Type	Prior OI	Settled OI	Change
110	11/06	put	14	14	0
115	11/06	put	127	127	0
120	11/06	call	1	1	0
120	11/06	put	222	232	+10
125	11/06	call	3	3	0
125	11/06	put	23	23	0
130	11/06	put	125	124	-1
131	11/06	put	6	6	0
132	11/06	put	37	37	0
133	11/06	put	12	12	0
134	11/06	call	1	1	0
134	11/06	put	268	267	-1
135	11/06	call	5	5	0
135	11/06	put	72	66	-6
136	11/06	call	2	2	0
136	11/06	put	55	59	+4
137	11/06	call	1	11	+10
137	11/06	put	87	70	-17
138	11/06	call	2	2	0
138	11/06	put	40	83	+43
139	11/06	call	2	2	0
139	11/06	put	24	43	+19
140	11/06	call	4	5	+1
140	11/06	put	33	37	+4
141	11/06	call	3	3	0
141	11/06	put	18	19	+1
142	11/06	call	24	24	0
142	11/06	put	48	48	0
143	11/06	call	32	31	-1
143	11/06	put	13	17	+4
144	11/06	call	28	28	0
144	11/06	put	14	18	+4
145	11/06	call	250	250	0
145	11/06	put	50	51	+1
146	11/06	call	42	40	-2
146	11/06	put	1	1	0
147	11/06	call	440	451	+11
148	11/06	call	26	34	+8
148	11/06	put	1	1	0
149	11/06	call	7	7	0
149	11/06	put	52	52	0
150	11/06	call	424	415	-9
150	11/06	put	31	31	0
152.5	11/06	call	122	119	-3
155	11/06	call	822	836	+14
157.5	11/06	call	122	126	+4
160	11/06	call	278	349	+71
160	11/06	put	5	5	0
162.5	11/06	call	17	17	0
165	11/06	call	16	46	+30
167.5	11/06	call	1	31	+30
170	11/06	call	37	149	+112
172.5	11/06	call	24	24	0
175	11/06	call	11	11	0
180	11/06	call	4	4	0
200	11/06	call	1	1	0
215	11/06	call	1	1	0

Expiration 2026-11-13

MRK open interest, settled 2026-10-21, expiration 2026-11-13, strikes 110 to 185

Strike	Expiry	Type	Prior OI	Settled OI	Change
110	11/13	put	21	21	0
115	11/13	put	1	7	+6
120	11/13	put	107	107	0
125	11/13	put	18	13	-5
129	11/13	put	1	1	0
130	11/13	call	7	7	0
130	11/13	put	30	30	0
131	11/13	put	2	2	0
132	11/13	call	8	8	0
132	11/13	put	4	4	0
133	11/13	put	4	4	0
134	11/13	put	15	15	0
135	11/13	call	4	4	0
135	11/13	put	45	45	0
136	11/13	put	136	136	0
137	11/13	put	5	5	0
138	11/13	put	24	24	0
139	11/13	put	21	21	0
140	11/13	call	4	4	0
140	11/13	put	14	14	0
141	11/13	call	5	5	0
141	11/13	put	4	4	0
142	11/13	call	4	4	0
142	11/13	put	26	27	+1
143	11/13	call	2	2	0
143	11/13	put	24	24	0
144	11/13	call	3	3	0
144	11/13	put	5	5	0
145	11/13	call	8	8	0
145	11/13	put	8	8	0
146	11/13	call	4	4	0
147	11/13	call	12	12	0
147	11/13	put	2	3	+1
148	11/13	call	16	20	+4
149	11/13	call	2	3	+1
149	11/13	put	1	1	0
150	11/13	call	60	61	+1
150	11/13	put	8	8	0
152.5	11/13	call	13	12	-1
152.5	11/13	put	0	1	+1
155	11/13	call	342	344	+2
155	11/13	put	3	3	0
157.5	11/13	call	171	171	0
160	11/13	call	98	97	-1
162.5	11/13	call	23	23	0
165	11/13	call	21	21	0
167.5	11/13	call	5	430	+425
175	11/13	call	1	1	0
180	11/13	call	3	3	0
180	11/13	put	1	1	0
185	11/13	call	3	3	0

Expiration 2026-11-20

MRK open interest, settled 2026-10-21, expiration 2026-11-20, strikes 95 to 210

Strike	Expiry	Type	Prior OI	Settled OI	Change
95	11/20	put	2	2	0
100	11/20	call	21	21	0
100	11/20	put	154	154	0
105	11/20	call	1	1	0
105	11/20	put	41	41	0
110	11/20	call	32	32	0
110	11/20	put	1,819	1,829	+10
115	11/20	call	19	19	0
115	11/20	put	130	134	+4
120	11/20	call	38	38	0
120	11/20	put	633	632	-1
125	11/20	call	1,049	1,047	-2
125	11/20	put	2,158	2,166	+8
130	11/20	call	227	227	0
130	11/20	put	3,155	3,127	-28
134	11/20	put	1	1	0
135	11/20	call	196	196	0
135	11/20	put	9,757	9,701	-56
136	11/20	put	2	7	+5
137	11/20	put	15	21	+6
138	11/20	put	1	6	+5
139	11/20	put	4	4	0
140	11/20	call	602	609	+7
140	11/20	put	4,272	4,240	-32
141	11/20	put	2	3	+1
142	11/20	call	6	6	0
142	11/20	put	0	1	+1
143	11/20	put	27	28	+1
144	11/20	call	21	21	0
144	11/20	put	0	2	+2
145	11/20	call	6,404	6,409	+5
145	11/20	put	4,177	4,195	+18
146	11/20	call	3	4	+1
146	11/20	put	8	8	0
147	11/20	call	31	32	+1
147	11/20	put	2	501	+499
148	11/20	call	47	52	+5
148	11/20	put	11	41	+30
149	11/20	call	245	278	+33
150	11/20	call	6,003	6,028	+25
150	11/20	put	1,354	1,354	0
152.5	11/20	call	101	104	+3
155	11/20	call	3,688	3,742	+54
155	11/20	put	339	365	+26
157.5	11/20	call	302	311	+9
160	11/20	call	5,573	5,644	+71
160	11/20	put	142	142	0
162.5	11/20	call	32	35	+3
165	11/20	call	4,042	4,431	+389
165	11/20	put	31	31	0
167.5	11/20	call	4	8	+4
170	11/20	call	2,352	2,229	-123
170	11/20	put	48	48	0
175	11/20	call	1,088	1,071	-17
180	11/20	call	738	738	0
185	11/20	call	108	108	0
190	11/20	call	232	178	-54
195	11/20	call	10	10	0
200	11/20	call	12	12	0
210	11/20	call	2	2	0

Expiration 2026-11-27

MRK open interest, settled 2026-10-21, expiration 2026-11-27, strikes 125 to 175

Strike	Expiry	Type	Prior OI	Settled OI	Change
125	11/27	put	1	1	0
129	11/27	put	5	5	0
130	11/27	call	13	13	0
130	11/27	put	3	4	+1
131	11/27	put	3	3	0
132	11/27	put	1	4	+3
133	11/27	put	3	3	0
134	11/27	put	3	3	0
135	11/27	call	2	2	0
135	11/27	put	4	5	+1
136	11/27	put	4	4	0
137	11/27	put	4	4	0
138	11/27	call	0	1	+1
138	11/27	put	3	3	0
139	11/27	put	3	3	0
140	11/27	call	10	10	0
140	11/27	put	70	70	0
141	11/27	put	2	2	0
142	11/27	call	0	1	+1
142	11/27	put	1	1	0
143	11/27	call	1	1	0
143	11/27	put	2	2	0
144	11/27	call	0	1	+1
145	11/27	call	4	4	0
145	11/27	put	70	70	0
146	11/27	call	1	1	0
146	11/27	put	8	8	0
147	11/27	call	0	1	+1
147	11/27	put	16	17	+1
148	11/27	call	1	3	+2
149	11/27	call	0	1	+1
149	11/27	put	1	1	0
150	11/27	call	16	16	0
150	11/27	put	16	16	0
152.5	11/27	call	5	6	+1
152.5	11/27	put	1	1	0
155	11/27	call	15	17	+2
157.5	11/27	call	11	11	0
160	11/27	call	24	25	+1
162.5	11/27	call	2	2	0
165	11/27	call	1	1	0
175	11/27	call	30	31	+1

Later expirations (2026-12-18, 2027-01-15, 2027-03-19, 2027-04-16, 2027-06-17, 2027-09-17, 2027-12-17, 2028-01-21, 2029-01-19) and all other strikes are in the Markdown table.

Markdown table | Open interest changes across symbols

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